The connections are 3/8''. I use a 3 way 2 port valve to pilot the QEV.So it's semi automatic, and the barrel is 7mm, unfortunately no 6mm :/I guess my chamber is kinda good for bb's, please comment if it's not right I've weld my own air tank, and am able to charge it to 15 bar max with my pump or compressor ( tire valve )Thanks to Wyz2285 for this awesome idea for qev and 3 way valve.I'm pretty stuck with the trigger, made a wooden sample. It's too big and unhandyThe idea was that i'll make a wooden stock with grip to use the trigger valve.I have actually no idea what kind of magazine I should make, but I've some ideas for loading the bb.Also the ball detend is a pretty hard thingy to make it functional :SLook at the picture for some usable information.Really apreciate if you have some comments for me, so I can go further with building my gun

When something isn't really clear, just comment and I'll explain it explicit!

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if you want it to be a sniper, you probably want to shoot long range and there is no way to do it with that pipe. and i suggest a fridge compressor for at least 30 bar. any how i think this setup works fine for multishoot with regulated pressure,

Yup, I am going to buy a Paintball tank with pressure regulator, but can't find any small regulators that goes to a low pressure of +/- 10 Bar. I guess my 3 way valve can't have alot of bar unfortunately

I own a handpump that can go to 15 bar, and a huge compressor which goes to 9 bar max.

I was thinking about getting an fire extinguisher and modify it with a pressure regulator to connect on my airgun whith push to connect fittings. Good idea? let me know.

And I'm going to order a new barrel of 6mm to have more accuracy with my bb's

Please reply for more help, It would be very nice and useful for my ongoing project ^^

you could make a barrel breach after the qev and use custom made ammunition with a 6 mm steel bb and a wax body like I saw on someone on this site. Just an idea .. You could also manufacture your own projectiles from lead or even use 7mm steel ball bearings, your choiseP.S.are those pneumatic valves ? if so, don't raise pressure, or else they will fail, the max operating pressure is 10 bars for pneumatic valves

try finding a paintball tank with a built in regulator, and you can manually adjust the output pressure for your own needs (there is a youtube video in which it's explained how you can lower the output pressure from 30 bars to less)I'm glad to hear you decided to change the barrel to a 6mm one. it should be OK for an airsoft sniper(I said airsoft=>not much power)

nice concept for the gun.if you wanted to make a few alterations to positioning, it could be more gun like and allow for a better trigger with the 3/2 valve.

1 the 90 elbow between the QEV and 3/2 should be straight2 the 3/2 should have the button down, a trigger can now be added with a pivot point to the top left allowing pullback to be transferred to upward motion. 3 swap the schrader valve and air tank positions that will allow the tank to be used as a stock.

hope this helps, this is the way that i have built 2 fully functioning semi auto C02 rifles. any other questions let us know

anarchy08 wrote:nice concept for the gun.if you wanted to make a few alterations to positioning, it could be more gun like and allow for a better trigger with the 3/2 valve.

1 the 90 elbow between the QEV and 3/2 should be straight2 the 3/2 should have the button down, a trigger can now be added with a pivot point to the top left allowing pullback to be transferred to upward motion. 3 swap the schrader valve and air tank positions that will allow the tank to be used as a stock.

hope this helps, this is the way that i have built 2 fully functioning semi auto C02 rifles. any other questions let us know

I understand your alteration instructions except for the second part of step 2 (trigger can now be added with a pivot point to the top left ). top left of what?